package io.github.kingschan1204.istock.common.util.spring;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

/**
 * spring 容器工具类
 * @author chenguoxiang
 * @create 2019-03-28 15:47
 **/
@Component
public class SpringContextUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(null==SpringContextUtil.applicationContext) {
            SpringContextUtil.applicationContext = applicationContext;
        }
    }

    /**
     * 获取applicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 通过name获取 Bean.
     * @param name
     * @return
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**
     * 通过class获取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

    /**
     * 得到spring ioc 容器里的配置
     * @return
     */
    public static Environment getEnv(){
        return getBean(Environment.class);
    }

    /**
     * 得到配置文件里的具体的配置项
     * @param key properties文件里的key
     * @return
     */
    public static String getProperties(String key ){
        return getEnv().getProperty(key);
    }
}
